LM98722CCMTX/NOPB [NSC]

IC SPECIALTY ANALOG CIRCUIT, PDSO56, ROHS COMPLIANT, TSSOP-56, Analog IC:Other;
LM98722CCMTX/NOPB
型号: LM98722CCMTX/NOPB
厂家: National Semiconductor    National Semiconductor
描述:

IC SPECIALTY ANALOG CIRCUIT, PDSO56, ROHS COMPLIANT, TSSOP-56, Analog IC:Other

时钟发生器 传感器 CD
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September 24, 2009  
LM98722  
3 Channel, 16-Bit, 45 MSPS Analog Front End with LVDS/  
CMOS Output, Integrated CCD/CIS Sensor Timing  
Generator and Spread Spectrum Clock Generation  
General Description  
Features  
The LM98722 is a fully integrated, high performance 16-Bit,  
45 MSPS signal processing solution for digital color copiers,  
scanners, and other image processing applications. High-  
speed signal throughput is achieved with an innovative archi-  
tecture utilizing Correlated Double Sampling (CDS), typically  
employed with CCD arrays, or Sample and Hold (S/H) inputs  
(for higher speed CCD or CMOS image sensors). The signal  
paths utilize 8 bit Programmable Gain Amplifiers (PGA), a  
+/-9-Bit offset correction DAC and independently controlled  
Digital Black Level correction loops for each input. The PGA  
and offset DAC are programmed independently allowing  
unique values of gain and offset for each of the three analog  
inputs. The signals are then routed to a 45MHz high perfor-  
mance analog-to-digital converter (ADC). The fully differential  
processing channel shows exceptional noise immunity, hav-  
ing a very low noise floor of -74dB. The 16-bit ADC has  
excellent dynamic performance making the LM98722 trans-  
parent in the image reproduction chain.  
LVDS/CMOS Outputs  
LVDS/CMOS/Crystal Clock Source with PLL Multiplication  
Integrated Flexible Spread Spectrum Clock Generation  
CDS or S/H Processing for CCD or CIS sensors  
Independent Gain/Offset Correction for Each Channel  
Automatic per-Channel Gain and Offset Calibration  
Programmable Input Clamp Voltage  
Flexible CCD/CIS Sensor Timing Generator  
Key Specifications  
Maximum Input Level  
1.2 or 2.4 Volt Modes  
(both with + or - polarity option)  
16-Bit  
ADC Resolution  
ADC Sampling Rate  
INL  
45 MSPS  
+18/-25 LSB (typ)  
22.5/22.5/15 MSPS  
256 Steps  
Channel Sampling Rate  
PGA Gain Steps  
PGA Gain Range  
Analog DAC Resolution  
Analog DAC Range  
Digital DAC Resolution  
Digital DAC Range  
SNR  
A very flexible integrated Spread Spectrum Clock Generation  
(SSCG) modulator is included to assist with EM compliance  
and reduce system costs.  
0.64 to 8.3x  
+/-9 Bits  
+/-307mV or +/-614mV  
+/-6 Bits  
Applications  
Multi-Function Peripherals  
-2048 LSB to + 2016 LSB  
-74dB (@0dB PGA Gain)  
630mW (LVDS)  
0 to 70°C  
High-speed Currency/Check Scanners  
Flatbed or Handheld Color Scanners  
Power Dissipation  
Operating Temp  
Supply Voltage  
High-speed Document Scanners  
3.3V Nominal (3.0V to 3.6V range)  
System Block Diagram  
30099570  
© 2009 National Semiconductor Corporation  
300995  
www.national.com  
LM98722 Overall Chip Block Diagram  
30099501  
FIGURE 1. Chip Block Diagram  
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2
LM98722 Pin Out Diagram  
30099502  
FIGURE 2. LM98722 Pin Out Diagram  
3
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Typical Application Diagram  
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4
Pin Descriptions  
Pin  
Name  
PHIC2  
I/O  
Typ  
Res  
PU  
Description  
Configurable high speed sensor timing output.  
1
2
3
4
O
D
PHIC1  
SH1  
CE  
O
O
I
D
D
D
PD  
PU  
Configurable high speed sensor timing output.  
Configurable low speed sensor timing output.  
Chip Serial Interface Address Setting Input  
CE Level  
VD  
Address  
01  
10  
00  
Float  
DGND  
5
6
7
8
9
CAL  
I
D
D
D
D
D
D
D
P
P
P
A
A
P
P
A
PD  
PU  
PD  
PD  
Initiate calibration sequence. Leave unconnected or tie to DGND if unused.  
Active-low master reset. NC when function not being used.  
External request for an SH interval.  
RESET  
SH_R  
SDI  
I
I
I
Serial Interface Data Input.  
SDO  
SCLK  
SEN  
O
I
Serial Interface Data Output.  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
PD  
PU  
Serial Interface shift register clock.  
I
Active-low chip enable for the Serial Interface.  
VA  
Analog power supply. Bypass voltage source with 4.7μF and pin with 0.1μF to AGND.  
Analog ground return.  
AGND  
VA  
Analog power supply. Bypass voltage source with 4.7μF and pin with 0.1μF to AGND.  
Bottom of ADC reference. Bypass with a 0.1μF capacitor to ground.  
Top of ADC reference. Bypass with a 0.1μF capacitor to ground.  
Analog power supply. Bypass voltage source with 4.7μF and pin with 0.1μF to AGND.  
Analog ground return.  
VREFB  
VREFT  
VA  
O
O
AGND  
VCLP  
IO  
Input Clamp Voltage. Normally bypassed with a 0.1μF , and a 4.7μF capacitor to AGND.  
An external reference voltage may be applied to this pin.  
20  
21  
22  
23  
24  
25  
26  
27  
28  
VA  
P
A
P
A
P
A
P
A
A
Analog power supply. Bypass voltage source with 4.7μF and pin with 0.1μF to AGND.  
Bias setting pin. Connect a 9.0 kOhm 1% resistor to AGND.  
Analog ground return.  
IBIAS  
AGND  
OSR  
O
I
Analog input signal. Typically sensor Red output AC-coupled thru a capacitor.  
Analog ground return.  
AGND  
OSG  
I
Analog input signal. Typically sensor Green output AC-coupled thru a capacitor.  
Analog ground return.  
AGND  
OSB  
I
Analog input signal. Typically sensor Blue output AC-coupled thru a capacitor.  
CPOFILT2  
Charge Pump Filter Capacitor. Bypass this supply pin with a 0.1μF capacitor to  
CPOFILT1.  
29  
30  
DGND  
P
A
Digital ground return.  
CPOFILT1  
Charge Pump Filter Capacitor. Bypass this supply pin with a 0.1μF capacitor to  
CPOFILT2.  
31  
32  
DVB  
O
I
D
D
Digital Core Voltage bypass. Not an input. Bypass with 0.1μF capacitor to DGND.  
Clock Input. Non-Inverting input for LVDS clocks or CMOS clock input. CMOS clock is  
selected when pin 29 is held at DGND, otherwise clock is configured for LVDS operation.  
INCLK+  
33  
34  
INCLK-  
I
D
D
Clock Input. Inverting input for LVDS clocks, connect to DGND for CMOS clock.  
Bit 7 of the digital video output bus in CMOS Mode, LVDS Frame Clock+ in LVDS Mode.  
DOUT7/  
TXCLK+  
DOUT6/  
TXCLK-  
DOUT5/  
TXOUT2+  
O
35  
36  
O
O
D
D
Bit 6 of the digital video output bus in CMOS Mode, LVDS Frame Clock- in LVDS Mode.  
Bit 5 of the digital video output bus in CMOS Mode, LVDS Data Out2+ in LVDS Mode.  
5
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Pin  
37  
Name  
DOUT4/  
I/O  
Typ  
Res  
Description  
O
D
Bit 4 of the digital video output bus in CMOS Mode, LVDS Data Out2- in LVDS Mode.  
TXOUT2-  
DOUT3/  
TXOUT1+  
DOUT2/  
TXOUT1-  
DOUT1/  
TXOUT0+  
DOUT0/  
TXOUT0-  
DGND  
38  
39  
40  
41  
O
O
O
O
O
D
D
D
D
Bit 3 of the digital video output bus in CMOS Mode, LVDS Data Out1+ in LVDS Mode.  
Bit 2 of the digital video output bus in CMOS Mode, LVDS Data Out1- in LVDS Mode.  
Bit 1 of the digital video output bus in CMOS Mode, LVDS Data Out0+ in LVDS Mode.  
Bit 0 of the digital video output bus in CMOS Mode, LVDS Data Out0- in LVDS Mode.  
Configurable sensor control output.  
42  
43  
D
P
PD  
VD  
Power supply for the digital circuits. Bypass this supply pin with 0.1μF capacitor. A single  
4.7μF capacitor should be used between the supply and the VD, VR and VC pins.  
44  
45  
VC  
P
D
Power supply for the sensor control outputs. Bypass this supply pin with 0.1μF capacitor.  
Output clock for registering output data when using CMOS outputs, or a configurable  
low speed sensor timing output.  
CLKOUT/SH2 O  
46  
47  
48  
49  
50  
51  
52  
SH3  
RS  
O
O
O
O
O
D
D
D
D
D
P
P
Configurable low speed sensor timing output.  
Configurable high speed sensor timing output.  
Configurable high speed sensor timing output.  
Configurable high speed sensor timing output.  
Configurable high speed sensor timing output.  
Digital ground return.  
CP  
PHIA1  
PHIA2  
DGND  
VC  
Power supply for the sensor control outputs.  
Bypass this supply pin with 0.1μF capacitor.  
Configurable high speed sensor timing output.  
Configurable high speed sensor timing output.  
Configurable low speed sensor timing output.  
Configurable low speed sensor timing output.  
53  
54  
55  
56  
PHIB1  
PHIB2  
SH4  
O
O
O
O
D
D
D
D
SH5  
(I=Input), (O=Output), (IO=Bi-directional), (P=Power), (D=Digital), (A=Analog), (PU=Pull Up with an internal resistor), (PD=Pull Down with an internal resistor.).  
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6
<66°C/W  
>1.89W  
Thermal Resistance (θJA  
Package Dissipation at TA = 25°C  
(Note 4)  
)
Absolute Maximum Ratings (Note 1, Note  
2)  
If Military/Aerospace specified devices are required,  
please contact the National Semiconductor Sales Office/  
Distributors for availability and specifications.  
ESD Rating (Note 5)  
Human Body Model  
Machine Model  
2500V  
250V  
Supply Voltage (VA,VR,VD,VC)  
4.2V  
Storage Temperature  
−65°C to +150°C  
Voltage on Any Input Pin  
(Not to exceed 4.2V)  
Voltage on Any Output Pin  
−0.3V to  
(VA + 0.3V)  
−0.3V to  
(VA + 0.3V)  
Soldering process must comply with National  
Semiconductor’s Reflow Temperature Profile  
specifications. Refer to www.national.com/packaging.  
(Note 6)  
(execpt DVB and not to exceed 4.2V)  
DVB Output Pin Voltage  
2.0V  
Operating Ratings (Note 1, Note 2)  
Input Current at any pin other than  
Supply Pins (Note 3)  
Package Input Current (except Supply  
Pins) (Note 3)  
±25 mA  
Operating Temperature Range  
0°C TA +70°C  
±50 mA  
150°C  
All Supply Voltage  
+3.0V to +3.6V  
Maximum Junction Temperature (TA)  
Electrical Characteristics  
The following specifications apply for VA = VD = VC = 3.3V, CL = 10pF, and fINCLK = 15MHz unless otherwise specified. Boldface  
limits apply for TA = TMIN to TMAX; all other limits TA = 25°C.  
Min  
(Note 9)  
Typ  
(Note 8)  
Max  
(Note 9)  
Symbol  
Parameter  
Conditions  
Units  
CMOS Digital Input DC Specifications (RESETb, SH_R, SCLK, SENb)  
VIH  
VIL  
Logical “1” Input Voltage  
Logical “0” Input Voltage  
Logic Input Hysteresis  
Logical “1” Input Current  
2.0  
V
V
0.8  
VIHYST  
IIH  
0.6  
VIH = VD  
RESET,SEN  
SH_R, SCLK, SDI, CAL  
CE  
100  
65  
nA  
μA  
nA  
30  
IIL  
Logical “0” Input Current  
VIL = DGND  
RESETSEN  
-65  
-100  
-30  
μA  
nA  
μA  
SH_R, SCLK, SDI, CAL  
CE  
CMOS Digital Output DC Specifications (SH1 to SH5, RS, CP, PHIA, PHIB, PHIC)  
VOH  
VOL  
IOS  
Logical “1” Output Voltage  
Logical “0” Output Voltage  
Output Short Circuit Current  
IOUT = -0.5mA  
IOUT = 1.6mA  
VOUT = DGND  
VOUT= VD  
3.0  
V
V
0.21  
18  
-25  
20  
mA  
IOZ  
CMOS Output TRI-STATE Current  
VOUT = DGND  
VOUT = VD  
nA  
-25  
CMOS Digital Output DC Specifications (CMOS Data Outputs)  
VOH  
VOL  
IOS  
Logical “1” Output Voltage  
Logical “0” Output Voltage  
Output Short Circuit Current  
IOUT = -0.5mA  
IOUT = 1.6mA  
VOUT = DGND  
VOUT= VD  
2.3  
0.12  
12  
V
V
mA  
-14  
20  
IOZ  
CMOS Output TRI-STATE Current  
VOUT = DGND  
VOUT = VD  
nA  
-25  
7
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Min  
(Note 9)  
Typ  
(Note 8)  
Max  
(Note 9)  
Symbol  
Parameter  
Conditions  
Units  
LVDS/CMOS Clock Receiver DC Specifications (INCLK+ and INCLK- Pins)  
VIHL  
Differential LVDS Clock  
High Threshold Voltage  
200  
mV  
RL = 100Ω  
VCM (LVDS Input Common Mode  
Voltage)= 1.25V  
VILL  
VIHC  
VILC  
IIHL  
Differential LVDS Clock  
Low Threshold Voltage  
CMOS Clock  
-200  
2.0  
mV  
V
INCLK- = DGND  
High Threshold Voltage  
CMOS Clock  
0.8  
V
Low Threshold Voltage  
CMOS Clock  
230  
260  
μA  
μA  
Input High Current  
CMOS Clock  
IILC  
-135  
-120  
Input Low Current  
LVDS Output DC Specifications  
VOD  
VOS  
IOS  
Differential Output Voltage  
280  
390  
1.20  
8.5  
490  
mV  
V
RL = 100Ω  
LVDS Output Offset Voltage  
Output Short Circuit Current  
1.08  
1.33  
mA  
VOUT = 0V, RL = 100Ω  
LVDS Output Data Format  
Power Supply Specifications  
IA  
VA Analog Supply Current  
139  
3.1  
162  
4.5  
mA  
mA  
LVDS Output Data Format  
(Powerdown)  
CMOS Output Data Format  
(40 MHz)  
137  
161  
mA  
ID  
VD Digital Output Driver Supply  
Current  
LVDS Output Data Format  
50  
65  
8
mA  
mA  
LVDS Output Data Format  
(Powerdown)  
5.5  
CMOS Output Data Format  
(ATE Loading of CMOS Outputs  
> 50 pF) (40 MHz)  
48  
1
62  
4
mA  
mA  
IC  
VC CCD Timing Generator Output  
Driver Supply Current  
Typical sensor outputs:  
SH1-SH5, PHIA, PHIB, PHIC,  
RS, CP  
(ATE Loading of CMOS  
Outputs > 50pF)  
PWR  
Average Power Dissipation  
LVDS Output Data Format  
630  
28  
736  
32  
mW  
mW  
LVDS Output Data Format  
(Powerdown)  
CMOS Output Data Format  
(ATE Loading of CMOS Outputs  
> 50pF) (40 MHz)  
600  
740  
mW  
Input Sampling Circuit Specifications  
VIN  
Input Voltage Level  
CDS Gain=1x, PGA Gain=1x  
CDS Gain=2x, PGA Gain= 1x  
2.3  
Vp-p  
1.22  
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8
Min  
(Note 9)  
Typ  
(Note 8)  
Max  
(Note 9)  
Symbol  
Parameter  
Conditions  
Units  
IIN_SH  
Sample and Hold Mode  
Input Leakage Current  
Source Followers Off  
CDS Gain = 1x  
19  
25  
μA  
(-103)  
(-152)  
(-250)  
(-95)  
OSX = VA (OSX = AGND)  
Source Followers Off  
CDS Gain = 2x  
33  
50  
μA  
nA  
pF  
(-141)  
OSX = VA (OSX = AGND)  
Source Followers On  
CDS Gain = 2x  
20  
250  
(-50)  
OSX = VA (OSX = AGND)  
CSH  
Sample/Hold Mode  
CDS Gain = 1x  
2.5  
Equivalent Input Capacitance  
CDS Gain = 2x  
Source Followers Off  
OSX = VA (OSX = AGND)  
4
pF  
nA  
IIN_CDS  
RCLPIN  
CDS Mode  
10  
250  
55  
Input Leakage Current  
(-250)  
(-50)  
CLPIN Switch Resistance  
(OSX to VCLP Node)  
16  
VCLP Reference Circuit Specifications  
VCLP Voltage 000  
VCLP Voltage Setting = 000  
VCLP Voltage Setting = 001  
VCLP Voltage Setting = 010  
VCLP Voltage Setting = 011  
VCLP Voltage Setting = 100  
VCLP Voltage Setting = 101  
VCLP Voltage Setting = 110  
VCLP Voltage Setting = 111  
0.85VA  
0.9VA  
0.95VA  
0.6VA  
0.55VA  
0.4VA  
0.35VA  
0.15VA  
30  
V
V
VCLP Voltage 001  
VCLP Voltage 010  
V
VCLP Voltage 011  
VVCLP  
V
VCLP Voltage 100  
V
VCLP Voltage 101  
VCLP Voltage 110  
VCLP Voltage 111  
V
V
V
ISC  
VCLP DAC Short Circuit Output  
Current  
0001 xxxxb VCLP Config.  
Register =  
mA  
Black Level Offset DAC Specifications  
Resolution  
10  
Bits  
Monotonicity  
Guaranteed by characterization  
Offset Adjustment Range  
Referred to AFE Input  
CDS Gain = 1x  
Minimum DAC Code = 0x000  
Maximum DAC Code = 0x3FF  
CDS Gain = 2x  
-614  
614  
mV  
mV  
Minimum DAC Code = 0x000  
Maximum DAC Code = 0x3FF  
Minimum DAC Code = 0x000  
-307  
307  
Offset Adjustment Range  
Referred to AFE Output  
DAC LSB Step Size  
-17500  
-16130  
+17500  
1.2  
LSB  
mV  
Maximum DAC Code = 0x3FF +16130  
CDS Gain = 1x  
Referred to AFE Output  
-0.85  
(32)  
(LSB)  
LSB  
DNL  
INL  
Differential Non-Linearity  
Integral Non-Linearity  
+0.74/  
-0.37  
+2.4  
+2.5  
-2.5  
+0.72/  
-0.56  
LSB  
Bits  
PGA Specifications  
Gain Resolution  
Monotonicity  
8
Guaranteed by characterization  
Maximum Gain  
CDS Gain = 1x  
CDS Gain = 1x  
7.7  
8.3  
8.8  
V/V  
dB  
17.7  
18.4  
18.9  
9
www.national.com  
Min  
(Note 9)  
Typ  
(Note 8)  
Max  
(Note 9)  
Symbol  
Parameter  
Conditions  
Units  
Minimum Gain  
CDS Gain = 1x  
CDS Gain = 1x  
0.58  
-4.7  
0.64  
-4.2  
0.70  
-3.5  
V/V  
dB  
PGA Function  
Gain (V/V) = (180/(277-PGA Code))  
Gain (dB) = 20LOG10(180/(277-PGA Code))  
Channel Matching  
Minimum PGA Gain  
3
%
Maximum PGA Gain  
12.7  
ADC Specifications  
VREFT  
VREFB  
Top of Reference  
2.07  
0.89  
1.18  
V
V
V
Bottom of Reference  
VREFT  
-
Differential Reference Voltage  
1.06  
1.30  
VREFB  
Overrange Output Code  
Underrange Output Code  
65535  
0
Digital Offset “DAC” Specifications  
Resolution  
7
32  
Bits  
Digital Offset DAC LSB Step Size  
Referred to AFE Output  
Min DAC Code =7b0000000  
Mid DAC Code =7b1000000  
Max DAC Code = 7b1111111  
LSB  
Offset Adjustment Range  
Referred to AFE Output  
-2048  
0
LSB  
+2016  
Full Channel Performance Specifications  
DNL  
INL  
Differential Non-Linearity  
Integral Non-Linearity  
(Note 10)  
(Note 10)  
-0.999  
-75  
+0.8/-0.7  
+18/-25  
-76  
2.5  
75  
LSB  
LSB  
Minimum PGA Gain  
dB  
(Note 10)  
10  
26  
LSB RMS  
dB  
SNR  
Total Output Noise  
Maximum PGA Gain  
-56  
(Note 10)  
96  
LSB RMS  
Channel to Channel Crosstalk  
Mode 3  
Mode 2  
26  
LSB  
17  
www.national.com  
10  
AC Timing Specifications  
The following specifications apply for VA = VD = VC = 3.3V, CL = 10pF, and fINCLK = 15MHz unless otherwise specified. Boldface  
limits apply for TA = TMIN to TMAX; all other limits TA = 25°C.  
Min  
(Note  
9)  
Typ  
(Note 8)  
Max  
(Note 9)  
Symbol  
Parameter  
Conditions  
Units  
Input Clock Timing Specifications  
INCLK = PIXCLK  
(Pixel Rate Clock)  
0.66  
1
15 (Mode 3)  
22.5 (Mode 2)  
22.5 (Mode 1)  
45 (Mode 3)  
45 (Mode 2)  
22.5 (Mode 1)  
60/40  
MHz  
1
fINCLK  
Input Clock Frequency  
Input Clock Duty Cycle  
INCLK = ADCCLK  
(ADC Rate Clock)  
2
MHz  
%
Tdc  
40/60  
50/50  
Full Channel Latency Specifications  
PIXPHASE0  
PIXPHASE1  
PIXPHASE2  
PIXPHASE3  
PIXPHASE0  
PIXPHASE1  
PIXPHASE2  
PIXPHASE3  
PIXPHASE0  
PIXPHASE1  
PIXPHASE2  
PIXPHASE3  
24  
23 1/2  
23  
3 Channel Mode Pipeline Delay  
tLAT3  
TADC  
TADC  
TADC  
22 1/2  
21  
2 Channel Mode Pipeline Delay  
tLAT2  
20 1/2  
20  
19 1/2  
19  
1 Channel Mode Pipeline Delay  
tLAT1  
18 1/2  
18  
17 1/2  
SH_R Timing Specifications  
tSHR_S  
tSHR_H  
SH_R Setup Time  
SH_R Hold Time  
2
2
ns  
ns  
LVDS Output Timing Specifications  
TXpp0  
TXpp1  
TXpp2  
TXpp3  
TXpp4  
TXpp5  
TXpp6  
TXCLK to Pulse Position 0  
TXCLK to Pulse Position 1  
TXCLK to Pulse Position 2  
TXCLK to Pulse Position 3  
TXCLK to Pulse Position 4  
TXCLK to Pulse Position 5  
TXCLK to Pulse Position 6  
-0.46  
2.71  
0
0.46  
3.63  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
LVDS Output  
Specifications not  
tested in production.  
Min/Max guaranteed  
by design,  
3.17  
6.35  
9.52  
12.70  
15.87  
19.05  
5.89  
6.81  
9.06  
9.98  
12.24  
13.16  
16.33  
19.51  
characterization and statistical 15.41  
analysis.  
18.59  
CMOS Output Timing Specifications  
fINCLK = 40MHz  
INCLK = ADCCLK  
(ADC Rate Clock)  
CLKOUT Rising Edge to CMOS  
tCRDO  
2
6
9
ns  
Output Data Transition  
Serial Interface Timing Specifications  
11  
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Min  
(Note  
9)  
Typ  
(Note 8)  
Max  
(Note 9)  
Symbol  
Parameter  
Conditions  
Units  
fSCLK <= fINCLK  
INCLK = PIXCLK  
(Pixel Rate Clock)  
Mode 3/2/1  
15/22.5/22.5  
45/45/22.5  
MHz  
fSCLK  
Input Clock Frequency  
fSCLK <= fINCLK  
INCLK = ADCCLK  
(ADC Rate Clock)  
Mode 3/2/1  
MHz  
SCLK Duty Cycle  
Input Hold Time  
50/50  
ns  
ns  
ns  
ns  
tIH  
tIS  
1.5  
2.5  
1.5  
Input Setup Time  
tSENSC  
SCLK Start Time After SEN Low  
SEN High after last SCLK Rising  
Edge  
tSCSEN  
2.5  
ns  
TINCLK  
ns  
INCLK present  
6
tSENW  
SEN Pulse Width  
INCLK stopped  
50  
(Note 11, Note 12)  
tOD  
tHZ  
Output Delay Time  
11  
14  
ns  
TSCLK  
Data Output to High Z  
0.5  
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is  
functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed  
specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test  
conditions. Operation of the device beyond the Operating Ratings is not recommended.  
Note 2: All voltages are measured with respect to AGND = DGND = 0V, unless otherwise specified.  
Note 3: When the input voltage (VIN) at any pin exceeds the power supplies (VIN < GND or VIN > VA or VD), the current at that pin should be limited to 25 mA.  
The 50 mA maximum package input current rating limits the number of pins that can simultaneously safely exceed the power supplies with an input current of 25  
mA to two.  
Note 4: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJMAX, θJA and the ambient temperature, TA. The maximum  
allowable power dissipation at any temperature is PD = (TJMAX – TA)/θJA. The values for maximum power dissipation listed above will be reached only when the  
device is operated in a severe fault condition (e.g. when input or output pins are driven beyond the power supply voltages, or the power supply polarity is reversed).  
Such conditions should always be avoided.  
Note 5: Human body model is 100 pF capacitor discharged through a 1.5 kresistor. Machine model is 220 pF discharged through 0Ω.  
Note 6: Reflow temperature profiles are different for lead-free and non-lead-free packages.  
Note 7: The analog inputs are protected as shown below. Input voltage magnitudes beyond the supply rails will not damage the device, provided the current is  
limited per note 3. However, input errors will be generated If the input goes above VA and below AGND.  
30099571  
Note 8: Typical figures are at TA = 25°C, and represent most likely parametric norms at the time of product characterization. The typical specifications are not  
guaranteed.  
Note 9: Test limis are guaranteed to National's AOQL (Average Outgoing Quality Level).  
Note 10: This parameter guaranteed by design and characterization.  
Note 11: If the input INCLK is divided down to a lower internal clock rate via the PLL, the parameter tSENW will be increased by the same factor.  
Note 12: When the Spread Spectrum Clock Generation feature is enabled, tSENW should be increased by 1.  
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12  
Physical Dimensions inches (millimeters) unless otherwise noted  
56-Lead TSSOP  
NS Package Number MTD56  
13  
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Notes  
For more National Semiconductor product information and proven design tools, visit the following Web sites at:  
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www.national.com/packaging  
www.national.com/quality/green  
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Serial Digital Interface (SDI) www.national.com/sdi  
Mil/Aero  
Temperature Sensors  
Wireless (PLL/VCO)  
www.national.com/tempsensors SolarMagic™  
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PowerWise® Design  
University  
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